Subway-ventilator.



G. W. JACKSON.A SUBWAY VENTILATOR. APPLICATION FILED APR.30, 1906. 974,151,2 Patented Nov.1,1910..

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GEORGE W. JACKSON, OF CHICAGO, ILLINOIS.

p OFFICE.

SUBWAY-VENTILATOR.

Specification of Letters Patent.

Patented Nov. 1, 1910.

Application filed April 30, 1906. Serial No. 314,437.

To all 11i/wm. it may concern:

Be it known that I, GEORGE W. JACKSON, a citizen of the United States, residing at Ciicago, in the county of Cook and State of Illinois, have invented cert-ain new and useful Improvements in Subway-Ventilators, of which the following is a specification.

lVIy invention relates to subway ventilators; and has for its object to provide a new and improved system for Ventilating subways.

To this end my invention consists in the details and combinations hereinafter described and claimed.

In the accompanying drawings-Figure l is a transverse sectional view of a subway with my improved Ventilating means connected therewith. Fig. 2 is a transverse sectional detail, showing` a modification.

As is well-known, great diiiiculty is eX- perienced in properly Ventilating subways used for street cars in which a great number of passengers are carried when the air has become stagnant and foul therein. Various systems have been proposed to overcome the diiiiculty, but 4so far as I am aware none have been successful in changing the air with the desired rapidity, furnishing a suiiicient quantity of pure air to the subway.

In the drawings, a indicates a subway, which may be of any ordinary construction; I have shown a subway comprising main central divisions b2 for the passage of cars and passengers and lateral sections b and upper sections 1, 2, 3 and 4 for the passage of conduits, pipes, electric wires, and telephone cables for service distribution &c. Adjacent the subway and at suitable intervals I provide stacks or chimneys c of sufficient height. These stacks or chimneys are connected to the subway by suction pipes or conduits d, d as shown, the conduit d terminating in the upper portion of the subway and the conduit d at the lower portion of the subway. At their outer ends these conduits are united into a single opening d4 within the chimney, upturned as shown. The conduits are provided at their ends within the subway with valves cl2, d3 whereby they may be opened or closed as desired. Within the chimney below the upturned ends of the conduits I provide a heating means e which may be of any desired construction.

It will now be readily understood that the heating device will cause a current of hot air to rise in the chimney, this current flowing by the open end of the conduits and drawing the foul air through the conduits from the subway, whence it is carried upwardly and discharged from the chimney. If desired, I may provide a pipe f, having an upturn'ed end within the open end of the conduit, as shown in Fig. 2, this pipe leading to any suitable source of supply of compressed` air or steam under pressure, a suitable valve f being provided for the purpose of opening and closing the compressed air pipe. By admitting compressed air or steam or Huid under pressure into the open end of the conduit, I materially assist the suction of the foul air from the subway by the column of the heated air.

My ventilating device is exceedingly simple and efficient in operation and overcomes many of the diiiculties hitherto experienced in providing for the proper ventilation of subways.

I claim:

l. In combination, an underground sub` way, a chimney at one si de and a little above the same, said chimney having a provision in the bottom thereof for a fire, an upwardly directed nozzle within the chimney above said tire, two conduits connected to discharge through said nozzle, one of said conduits leading from a point near the bottom of the subway and the other conduit leading from a point near the top of the subway, and respective valves on said conduits at the points where they terminate within the subway.

2. In combination, an underground subway, a chimney at one side and a little above the same, said chimney having a provision in the bottom thereof for a fire, an upwardly directed nozzle within the chimney rabove said fire, two conduits connected to discharge through said nozzle, one of said conduits leading from a point near the bottom of the subway and the other conduit leading from a point near the top of the subway, both of said conduits opening into the subway by downwardly directed openings, and respective valves on said conduits at the points where they terminate within the subway.

GEORGE W. JACKSON. 

